Have you tried this:
1. Turn OFF.
2. Press and hold the F2 key while turning.
3.If the BIOS/Settings screen appears release the F2 key.
4. Tap on F9 key and hit enter key without changing the option.
5. Tap on F10 key and hit enter key without changing the option.
6. It should restart by itself.
Some have found this helps with some models of the Nitro 5:
". . .there is a pressurized micro-switch somewhere in the middle of the keyboard, near the letters X C V D F. I pressed down near that spot and push the power button at the same time, and finally the laptop turned on. For safe measure, I put pressure on the spot below the letters of the keyboard. This also works the same way when typing with other keys on the keyboard. Don't press down too hard, otherwise you may damage the internal hardware." Proceed with caution.